Behaviour changes worth knowing. Usually nothing to do.
Every upgrade_code script now runs in the test suite, so the scripts that rewrite custom code for new versions keep working. Use the '# test: false' and '# test: skip' markers for scripts that can't be tested this way.
Mentioned in: What's new in Odoo 20
On databases with glibc collations such as en_US.UTF-8, moving a node could leave its descendants with a stale parent_path. The range now uses COLLATE "C", and the parent_path index is rebuilt to match.
What changes for people working in Odoo, by app.
Bank statements are optional, so labels, help texts and messages now say transactions. Technical names are unchanged.
A new template lists the affected lots and products, building on the precise move-line tracking for recalls added earlier.
If the work email matches an internal user who is not yet an employee of the company, the form links that user instead of failing on a duplicate invite.
The domain on the activity's assigned user now leaves out light users, and it moved from the views to the model.
Mentioned in: Light users in Odoo 20: who counts, and the Point of Sale exception
_get_forbidden_access no longer rebuilds the list of allowed ids on every iteration when processing tens of thousands of messages.
Partners with only a VAT number can now be identified for French e-invoicing (EAS 0225 and PDP) without entering the SIREN separately.
Framework, tooling and code-level changes.
When the prefetch set held records the user can't read, non-stored computes fell back to one query per record. They now stay batched, which matters for portal and public pages.
A property definition without a name now raises the documented ValueError instead of KeyError, so create, write and import can report it.
Several POS store methods, such as openCashbox and resetCashier, are now overridable hooks so the v2 blackbox module can extend them. Custom POS patches of these flows should be checked.
Deleting attachments, for example when assets bundles are regenerated, no longer stalls on large databases while checking this foreign key.
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