Its happened in Novy Sobor, i wanted to loot some food out of a van where only the trunk can be opened.
I opened the trunk, walked as near to it while crouching as possible, looted it while using tab, walked backwards and after standing up my character was walking laggy and as fast as in crouching, when i crouched again the character was moving as fast as when im walking normal.

Played yesterday evening, the bug appeared again but its gut nothin to do with the van. I was crouching in a bush near to vybor military base and loaded some magazines, when i was standing up and wanted to move on the bug appeared again