[2.1.11] Biter expansions still sometimes generate worms only
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Gameboyaac
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- Posts: 2
- Joined: Wed Jul 15, 2026 3:42 pm
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[2.1.11] Biter expansions still sometimes generate worms only
I vaguely remember seeing this as patched, but apparently not. Biters still sometimes generate worm only bases on expanding. Suggested fix: walk without rhythm as to not attract the worms.
- Attachments
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- Worm only base:
- worms.jpg (1.23 MiB) Viewed 1227 times
Re: [2.1.11] Biter expansions still sometimes generate worms only
I too have noticed and found this quite irksome on 2.0.77
Re: [2.1.11] Biter expansions still sometimes generate worms only
134800 is still "Pending"
Re: [2.1.11] Biter expansions still sometimes generate worms only
Hello, thanks for the report,Gameboyaac wrote: Wed Jul 15, 2026 3:48 pm I vaguely remember seeing this as patched, but apparently not. Biters still sometimes generate worm only bases on expanding. Suggested fix: walk without rhythm as to not attract the worms.
Can you provide a save game?
Ideally one with the base and one before the expansion happened?
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Gameboyaac
- Manual Inserter

- Posts: 2
- Joined: Wed Jul 15, 2026 3:42 pm
- Contact:
Re: [2.1.11] Biter expansions still sometimes generate worms only
Klonan wrote: Wed Jul 15, 2026 6:20 pmHello, thanks for the report,Gameboyaac wrote: Wed Jul 15, 2026 3:48 pm I vaguely remember seeing this as patched, but apparently not. Biters still sometimes generate worm only bases on expanding. Suggested fix: walk without rhythm as to not attract the worms.
Can you provide a save game?
Ideally one with the base and one before the expansion happened?
I can provide 2 saves, my most recent and one on the day it occurred, although the nest is already cleared unfortunately. I've marked where the base was in the attached screenshot:
- Attachments
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- Where the base WAS
- Screenshot 2026-07-17 125607.png (109.58 KiB) Viewed 1018 times
Re: [2.1.11] Biter expansions still sometimes generate worms only
They still can be helpful, please upload them here and I can check themGameboyaac wrote: Fri Jul 17, 2026 4:05 pm I can provide 2 saves, my most recent and one on the day it occurred, although the nest is already cleared unfortunately. I've marked where the base was in the attached screenshot:
Re: [2.1.11] Biter expansions still sometimes generate worms only
Discovered worms only expansion in my game in version 2.1.12.
World was created in version 2.1.7 with default settings but I was playing on 2.1.12 when worms occured.
Worms spawned next to iron ore just outside southernmost wall.
There is 2.5h gap between those saves, I have no idea, when did worms spawn.
World was created in version 2.1.7 with default settings but I was playing on 2.1.12 when worms occured.
Worms spawned next to iron ore just outside southernmost wall.
There is 2.5h gap between those saves, I have no idea, when did worms spawn.
- Attachments
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- _autosave2.zip
- first save with worms expansion present
- (14.46 MiB) Downloaded 26 times
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- 2.1.zip
- latest save before worms expanded
- (14.17 MiB) Downloaded 27 times
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- factorio-current.log
- (13.79 KiB) Downloaded 23 times
Re: [2.1.11] Biter expansions still sometimes generate worms only
That's because the builder group happened to select only spitters.
Larger sized spitter can only build worms, meanwhile larger sized biters can only build spawners.
If the build group only contains biters, it would spawn only spawners without worms.
Larger sized spitter can only build worms, meanwhile larger sized biters can only build spawners.
If the build group only contains biters, it would spawn only spawners without worms.
Re: [2.1.11] Biter expansions still sometimes generate worms only
This is fixed for the next release, more info here:
134800
134800




