rxdb: Migrations do not work with LokiJS adapter

Hello!

Looks like data migrations (rxdb/plugins/migration) don’t work when I am using LokiJS adapter: migration function does run, but all the data just disappears (surprisingly it somewhat returns back after a few refreshes of the page).

I found that unit tests for migrations work only for pouchdb and I don’t know how to make them work with loki or other adapters. So I made a repository with the bug reproduction. It is nextjs project with two pages:

1. Db is initialized here https://github.com/11bit/repro-rxdb-lokijs-migrations-bug/blob/main/db/db.ts

2. On the index page I am wiping all the data from indexeddb and then creating a simple document with schema version 0 https://github.com/11bit/repro-rxdb-lokijs-migrations-bug/blob/main/pages/index.tsx#L11-L17

3. On the ‘/migrate’ page I am trying to migrate the created document to schema version 1 https://github.com/11bit/repro-rxdb-lokijs-migrations-bug/blob/main/pages/migrate.tsx#L11-L19

After running ‘/migrate’ page I don’t see any documents at all. But if I refresh the page a couple of times I can see an old document without any migrations applied. However, If I switch to pouchdb adapter, everything works well.

Is it something I am doing wrong with migrations or it’s a bug?