[Explanation: My English is very poor, The entire text was written with the aid of translation, please understand.]
Version Info

• Minecraft, 1.21.8-Fabric
• Wormhole, 1.1.16-Fabric

Description of the Bug
When the number of slot positions expanded by an actual existing Target Cell exceeds 10 (including the one slot provided by the Portal Stabilizer itself), the 'Portal Target' interface of the Portal Stabilizer can only display 10 slots (the scrollbar on the right is unusable). However, when attempting to move a position, it is actually possible to move to slots not shown in the GUI.

Steps to Reproduce

1. Set up a portal with several Target Cells; I used 3 Advanced Target Cells.
2. Directly open the Portal Stabilizer's GUI and click the 'Change Target' button.
3. This is how you'll encounter the bug I mentioned.

Screenshots
Step 1: Constructed portalConstructed portal.

Step 2: Portal Target GUI, Here. using the mouse wheel or dragging the scrollbar cannot scroll the list.

Step 3: Added a location and tried to move the location down.

Move to the slot before 10:

Move to the slot after 10. The coordinates here have been moved, but due to the aforementioned issue, this position cannot be selected at the moment:

Step 4: Close and reopen the GUI. The added item is selected, but it still does not appear in the list.

Step 5: Try removing one of the unused Advanced Target Cells. The Portal Frame marked in red in the picture corresponds to the Advanced Target Cell in Step 1.

Step 6: Reopening the 'Portal Target' GUI, the positions that originally existed but were not displayed have appeared.

E-mail
Due to regional network issues, I cannot see GitHub messages immediately. If necessary, please contact this email address:

[email protected]

Supplement: To avoid misunderstanding, it is specially noted that using Basic Target Cell can also reproduce this problem. The key point of this issue is that the total number of expansions exceeds 10.