Relational fields disappeared

And suddenly some relational fields disappeared from the forms!!!
Didn't changed anything!
* this are only a few of the missing relational fields! (I confess this is pretty annoying!)

Tried to create new relational fields, but they also don't show in the form!!!

It's curious that the relational fields inside fieldgroups didn't disappear, but all the relational fields that weren't inside a field group have disappeared!
Please see what's happening.
Thanks

Forgot to say that they don't appear when create a new item.
But they appear if editing an existing one that was created before they disappeared!

Noticed that saving an item (created before this bug) as a copy, when editing the new item the relational fields appear.
But if I delete the values, and the relational field is empty, then save, when editing again the relational field also disappear!
Nevertheless the items of type event, had values and the relational field also disappeared, like I showed you in the other 2 images.

Hello

i have updated website with patched version
it should be good now

Relation field should now work properly
inside / outside a fieldgroup