Owing to that certain community campaigns didn't include "stringtable_dictionary.dct" before, they cannot run with Modified Talker.

You'll see following message in console while loading the map:
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Map ????? missing stringtable dictionary, don't ship this way!!!
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Or error message like: https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1489499114 Temporarily remove Modified Talker when you are playing them or build string table yourself.[www.gamemaps.com]

Following numbers are file number of GameMaps.com.

1. Lego 4 Dead - lego4dead.vpk (2468)
   
2. Pasiri - pasiri.vpk (2512)
   
3. Crash Bandicoot Course 2: Electric Wumpaloo - l4d2_crashbandicoot2.vpk (2591)
   
4. Lost - lost.vpk (2625)
   
5. Highway To Hell - highwaytohell.vpk (2714)
   
6. Kokiri Forest - oot.vpk (2802)
   
7. Infected City - infected city.vpk (3126)
   
8. GoldenEye 4 Dead - goldeneye4dead.vpk (3198)
   
9. Heartbreak Fridge - heartbreakfridge.vpk (3278)
   
10. Never Ending War: Chapter 3 - neverendingwar.vpk (4652)
    
11. Frozen: Chapter 2 - frozen.vpk (6123)
    
12. Crescendo Collision - crescendocollision.vpk (6704)
    
13. Infected City II - ic2.vpk (7741)
    
14. The Parish Original Beta Map - parishbeta.vpk (8117)
    
15. Forgotten Mist - forgottenmist.vpk (8240)
    
16. BurningDownUnder - bdu.vpk (9456)
    
17. Let's Build Our Hideaway - lboh.vpk (12939)
    
18. Fatal Freight - fatalfreight_15.vpk (14002)
    
19. Undead Smackdown - l4d2_undead_smackdown.vpk (14590)
    
20. Secret Operation - wmconfidential.vpk (17736)
    
21. NO MERCY DAYTIME - l4d2 no mercy daytime.vpk (14739)
    
22. l4d2_thecoaster - l4d2_thecoaster.vpk (19484)
    
23. Dam It Remastered - myl4d2addons_pack.vpk (19946)
    
24. Divide: Final Moments - thedividestory.vpk (20155)
    
25. Divine Cybermancy - (21372) (Only level 9 got the issue.)

Blackout L4D2 V4 Updated
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=136421285
Fallout Twilight 1.2
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=346551866
IMPJAW C1
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1226928410
Dead County
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1345711325
Z-PTZ v1.0
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1662291776 Known community campaigns will conflict with Modified Talker because they had their own talker files. Temporarily remove them if you are using Modified Talker.

• Crash Course Enhanced - CCE (New Survivors) - crashcourse_ns.vpk (3196)
  
• Crash Course Enhanced - CCE (Old Survivors) - crashcourse.vpk (3214)
  
• Silent Hill L4D2 - silenthill.vpk (4099)
  
• Downtown Dine - downtowndine.vpk (9056) - It has included older Modified Talker!