Hi @Casao0 I've merged your thread with this one as it seems to be about the same problem.
There is unfortunately no fix at this time, but you can build a Portal playlist here if you want to play solo against bots (select the mode, maps, and set the AI to "PVP AI"). This issue doesn't seem to be present on Portal experiences, so you should be able to use vehicles and Lis without going beneath the map (potentially this is due to the servers being different from the 20Hz solo/coop ones).
Meant to reply to you, @ElliotLH. ^
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