In (forced) sequential mode, branches list are not set to index internally, lot of code rely on the fact that branches is set or not to know if it needs to use it or not.
In mixed mode, branches were always set and thus, some part of code (eg: deleting a key) rely on that, in mixed mode, when choosing sequential mode for the namespace, deleting a key crashed because of that.
In (forced) sequential mode, branches list are not set to index internally, lot of code rely on the fact that branches is set or not to know if it needs to use it or not.
In mixed mode, branches were always set and thus, some part of code (eg: deleting a key) rely on that, in mixed mode, when choosing sequential mode for the namespace, deleting a key crashed because of that.