UDIM missing tiles on 1010 texture set

When I import my .obj created in Agisoft Metashape with UDMI layout, everything works fine until I save a version with more than 9 texture files. The .1010 file, as it appears in the texture set list, has no associated tiles or map position, so projects wrongly onto the model. The remaining files project correctly, and the model displays fine in other apps so it's not a model issue. Also,, if I export with 9 or fewer files the problem doesn't occur. But I need more texture files to get the resolution I need. What's going on?   And is there any way to allocate it manually to position 1010?