So I now have had the time to look into your spawn room problem and it appears you can fix this by shaping your respawnroom brushes around the spawn properly and grouping them together (you can also use tf_show_mesh_decorations to show if things are set up right)

And a little something I noticed that I haven't had time to post due to work is that the nav you are using is based on an older version of the map which leads to very weird places (and the crate stack in the middle also blocks bots because of this)
Speaking of that stack:
https://cdn.discordapp.com/attachments/1076463166747328522/1093946952825188352/image.png
There's no nobuild on it

Wave 1
Lowered starting money to 400, payout remains the same
Added another spawn for the Soldier subwave

Wave 2
The GRU support now has a half-second shorter waitbetweenspawns

Wave 3
Added some swimming dudes for the boss Support
Adjusted Plane health once more

Wave 4
Replaced Soldier/Shotguns with Jetpack Pyros
Added some Scouts that spawn with the Megachamps

Wave 5
Bad to the Bone has a proper gang now
Bad to the Bone comes back 30sec after death now

Wave 6
Adjusted wave payout to 2000
Adjusted Soldier/Medic combo counts

I mentioned this on the Discord earlier but it's probably better to have this here as well:

Spies can spawn in the RED spawn room and as Elizabeth brought up, it's because the nav has marked the spawnroom wrong (https://cdn.discordapp.com/attachments/480416908223447052/1088904554868920400/image.png)

I did some messing around with this and this seems to be because of the way the func_respawnroom brushes are set up
Using a single giant func_respawnroom as a lazy fix seemed to have better results, but whether or not you can do a more clean solution by using multiple func_respawnroom grouped together is still worth looking into before going with the "lazy but works" solution

I'll get back to you on this later, unless you update the map with a fix of your own first

Wave 1
Bat Scouts are Support 1

Wave 2
Shortstops are Support limited
GRU Support now has one(1) extra second between spawns

Wave 3
Adjusted Planetank's bomb damage
Adjusted Planetank spawn times
Removed milk slow

Wave 4
Increased amount of Directhit+ResShooter Soldiers

Wave 5
Adjusted spawn time of second Blast Box
Adjusted riff play times again
Bad to the Bone can now destroy Buildings he runs into

Wave 6
Adjusted Planetank's bomb damage
Wave ends faster now
-- There was a 5sec delay for the outro to play out but it's three seconds now
Touching DEATHFUCKER spikes now launches you into the air

You ran Heavy/Medic both last time, so this time either no Heavy or no Medic

DEATHFUCKER's uber-piercing damage is probably the spikes at the top since those use trigger_hurt
it's a classic "haw haw" for those who want to sit on top of the Tank
and well, the Soldier + Uber Medic combos at the end of Wave 6 start spawning when the Giants have all spawned, so adjusting the rate of the Giant spawns is not going to affect much of anything
they're meant to be a lesser subwave to go along with DEATHFUCKER, so it's not just the Tank by itself

Beta 7a
- Fixed a case where the invisible barriers around the barricades did not want to actually turn off

General changes
- Planes use Blimp icon now

Wave 1
Increased wave payout by 200

Wave 2
Added Shortstops to Giant Mallet subwave
Changed KGB Champs to GRU Champs
Removed Engineers

Wave 3
Replaced Giant Soldiers with Giant Demos
-- Less health per Giant
Heavies now spawn with Giant Demos
Added second subwave consisting of Persian Demos + one (1) Giant Demo
Added second Plane to wave
-- 80sec waitbetweenspawns

Wave 4
Fixed Mega Champs firing invisible boxing gloves
Adjusted Mega Champ projectile damage
Removed Engineers

Wave 5
Halved Giant Soldier Totalcount
Adjusted riff play times

Wave 6
Added a titlecard to the final Tank
Adjusted Soldier+Medic spawn times

https://www.dropbox.com/s/h5llt6flv0mb14z/mvm_lotus_b2_adv_ledmotif.pop?dl=1

Beta 7
- Adjusted geometry at hatch to address people getting crushed by Tanks coming from the lower route
- Adjusted Tank teleport hints to (probably) fix Tanks nosediving into the ground upon spawning
- Removed clipping from the umbrellas at front so Sentry Busters don't get stuck
- Added clipping into the station tunnel, so Giants should get stuck less against the edges of the arch
- (attempted to) Fix a case where bots get brain problems if the bomb somehow ends up on the wrong side of a barrier

General changes
- Removed the custom weapons
- Added a little something to make Tanks explode on deploy
- Repositioned Plane path

Wave 1
- Removed Uber Medics on Super Baller
- Removed crits from the Scouts

Wave 2
- Switched Persians to KGB Heavies, lowered maxactive and slowed their spawns a bit
- Swapped Giant Medic to a Regen type

Wave 3
- Removed one Bigheal from the Giant Soldiers
- Adjusted Deflector spawn times
- Removed Bonk Scouts

Wave 4
- Mega Heavyweights have proper team colored projectiles
- Adjusted Giant Heavy spawn times
- Adjusted homing Buff projectile stats

Wave 5
- Biker is smaller now so he should get stuck less
- Biker returns faster now
- Changed Biker to use 'stomp' contact damage rather than trigger_hurt
-- Can't hurt people through Uber but now he is a giant hurtbox
- Adjusted Blast Box to not inherit Giant Black Box stats
- Removed one Giant Medic from Blast Box Squad
- Removed Mr. Big Shot
- Adjusted Scout/Pyro spawn times

Wave 6
- Adjusted Tank health
- Adjusted Giant clusterfun spawn times

https://www.dropbox.com/s/h5llt6flv0mb14z/mvm_lotus_b1_adv_ledmotif.pop?dl=1

v1 of the mission (already on the server)
https://www.dropbox.com/s/h5llt6flv0mb14z/mvm_lotus_a7_adv_ledmotif.pop?dl=1