Forceloaded chunks don't get loaded after server restart

I use the /forceload command to load certain chunks on my server. When I restart the server (e.g. by re-entering a single-player world) these chunks are not loaded automatically.

I have to fly toward the chunks until get loaded and then they stay loaded.

Recreated by:

• Open a new single-player world.

• Add a repeating command block saying "hi" somewhere.

• There will be "[@] Hi" in chat.

• /forceload that chunk. (/forceload add ~ ~)

• Fly far away s.t. that chunk would normally unload.

• There is still "[@] Hi" in chat.

• Exit the world.

• Re-enter the world.

• There is no "[@] Hi" in chat. 😞

• Fly towards the command block and it will again say "[@] Hi" in chat at some point.

• You can then fly away again and there is still "[@] Hi" in chat.