How update your old map in new patch?

About a week ago I started playing Valheim again and at the moment I have played about 40 hours on the new map and built a decent house, and just today a new patch was released in which a new biome was added and I don’t know how to add it to my already "old" map.
3:13 pm, December 6, 2022
Vysckevych 0 comments 0 likes

Unleashed replied to How update your old map in new patch? December 6, 2022 @ 6:47:30 am PST

Originally posted by teamguard:
If you have not yet explored an area classified as Mistlands it will generate that biome when you visit any such area. However, unless something was changed in the recent minor patches, the generated Mistlands area for any old map will be pretty bad, just a bunch of really tiny islands.

Not true, something else needs to be done to be able to play your old map/seed.
And I don't want any mod to play the world we already started.
3:13 pm, December 6, 2022
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teamguard replied to How update your old map in new patch? December 6, 2022 @ 6:41:59 am PST

If you have not yet explored an area classified as Mistlands it will generate that biome when you visit any such area. However, unless something was changed in the recent minor patches, the generated Mistlands area for any old map will be pretty bad, just a bunch of really tiny islands.
3:13 pm, December 6, 2022
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