We have a website with a fair amount of data displaying with 2 custom post type where the problems appeared : Candidat and Applications with relations between them.
Since the Toolset Types 3.4.2 update , the search by field is a lot slower than usual.
Also, we found out some data are not displayed anymore when searching.
When looking for a fix, we saw that there was a new table added and with a quick view it seems that some data were not transferred to the new table, is it possible that the migration is in cause ?
The website is idr.idrecrutement.ca, but it is behind a IP blocking system.
I was informed that this issue is already known and our development team is working on a patch that should be released next week if all the testing goes well.
What you can do is to wait for this patch to be available and then update.
If the issue still remains you can let us know and we take it from there.