Problems of persistante between Panel and blocks

[GeneraleCauchemar]

Version: 2.x-dev
Framework: Symfony 4.4 (Sonata Admin Bundle 3.77.0)

Two problems I've experienced but are quite hard to reproduce as they do not happen consistantly...

• Upon creating a new entity, filling the fields and adding a new block (with content) to the Panel, submitting the form and displaying it once again, no blocks appear. I haven't been able to reproduce this morning so I can't say for certain if the Block or Panel have been persisted or not;

• Upon updating an entity which already has a Panel with blocks inside (both Panel and Blocks have been persisted on creation), blocks disappear from the form when submitting in edit mode. Does not happen everytime either. From what I've seen though:

• the blocks still exist in the database
• the panel exists as well
• but there is no link between them in the umanit_block_panel_blocks joint table

Do not hesitate to ask for snippets if necessary, I don't know what can be useful to you.
Thanks!