Colorpalette compatibility system was broken so old color classes were not removed from snippets when being edited. The bug was introduced by [1]. Also if a compatibility color class happens to use the same css color as a current theme class, that one will now be shown as selected. [1]: https://github.com/odoo/odoo/commit/c20423313cf10f262e615badc0397e6ba4ef4087 closes odoo/odoo#51464 Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>