Villager with custom Offers : instantly closes on interact

Hi! I have a villager that I configured with custom offers. Up to 1.21.1, everything worked perfectly, but now (1.21.4), the UI just instantly closes after opening / interacting with the villager. Any idea about why? What's the proper way to customise villager Offers in 1.21.4? Also, it looks like I can't customise villager profession via nbt