I don’t know if this’ll get fixed later on but you can get Infinite Warp Crystals right now.
How to get the Warp Crystals.
First you need to go to your house and head to the portal.
Warp to this exact location (Zephyr Paradise -> Upper Valley).
you’ll need to go this place in the picture, get there by using the hook from Knifey but the crystal will be locked for now. (There will be some enemies the first time you go there.)
Go spend about 5 seconds listening to these two ♥♥♥♥♥♥♥♥ on the river and go back to the crystal.
The crystal will now be unlocked and ready for you to pick up.
Keep going back and forth to your house and Upper Valley and the crystal will keep respawning very close to you.
Hope you found this guide helpful.