"All Comp.." empty since i upgr. from 2.7 to 2.8

Dear OCS,

Once i upgraded the OCS Server i use at my work from 2.7.x to 2.8 in 2020, the "all computers" is empty.

EDIT: updated picture links
see here: https://cloud.grolman-group.com/s/VwIqYxCIJWypfyK

However the data is there, here you can see, there are infact a lot of computers (at least for my point of view ^^)

Overview: https://cloud.grolman-group.com/s/pkSB38aB4PlA5mE

Examples: https://cloud.grolman-group.com/s/3zeJl46izPeZzff

I've just updated to 2.9.1 but it always remains the same :(

PS: I also use a OCS privatly, there error did never appear there, so it not something general in my upgrade path i guess.

We can live with this, but it's quite... getting on our nerves ^^

Thanks for any help!

Kind regards
Marc