It seems that the crash is somehow related to BSP code, as models which now crash PCS2 also had missing polygons when rescaled with earlier version. Rescaling these models with polygons already missing crashes PCS2, regardless of the version used. Rescaling models which never had such issues works well.
Also, I found that these models crash PCS2 also upon opening and closing "proporties" window.
On my old computer, rescaling worked fine both in BSP and normal builds.
I'm attaching a model about which I'm sure had holes after rescaling without BSP code, as well as rescaled (by 1.5) version with holes. Both of them crash both versions of PCS2 when trying to rescale them.
[attachment deleted by ninja]