Removing the LMS app deleted the Skill (Designation) docType from the HR module

HR Designation records were working fine. I installed the LMS to look explore. I then unistalled and later found that i could not add new entries to the Designation list. I also could not view the Designation list. I tried to restore the doccType from Utilities but it said that the LMS module was missing. I reinstalled the LMS app and Designations in HR work fine now. It is weird that although i could not add new records to the Designation list, i could see all of the original ones. So the table was missing but still showing records. I dont understand that - maybe caching?

Using v14 on frappecloud.