Mirror modeling and some small issue?

[strange cobalt]

So I followed a older tutorial where they make half of the face then merge left and right together, but halfway through I see and trynna use that ig new mirror modeling feature.

The mesh is merged from two part(the other half is created by duplicate and flip), now if i enable mirror modeling it wouldn't work. Beside redo from scratch, is there a way to use half of my existing face mirror it and continue mirror modeling?

Another problem is that sometimes a new "created face" marked red, not sure if it effect the model but performing a loop cut will then have unexpected offset, as shown in 2nd ss. Is there a flip face or smth to fix this? My temp solution is remove face and edge, select all 4 corner then create face...

Also if i aren't using mirror modeling, and i have two same shape mesh but mirrored(not created by mirror modeling or duplicate&merge) and with different uv layout, how can i mirror uv from one side to another? First day of lowpoly modeling, a simple copy paste then flip the uv works in cube-based mode, but not in this mode.

[dreamy magnet]

Welcome to the help forum!

Please make sure to read #1021015331910713395 as it may answer your question!

Once your question has been resolved, please mark the post as closed by using the </close:1163944441741049897> command.

[strange cobalt]

oh also how having a merged mesh, checked and looks ok in uv mode, but when create texture, or just drag to apply texture on mesh, some mesh disappear...yes the face disappear entirely, checked when that happened it's not a blank uv layout issue...

hmmm, also anyway to have perfect snapped uv layout, especially if one wish to organize them, manually drag move and rotate aren't perfect.

[strange cobalt]

...

[strange cobalt]

k instead of extrude and create new faces, i use loop cut then move meshes around, this issue doesn't seem to happen now, also the wireframe look much clean

[strange cobalt]

also this, idk how to close with two triangle without breaking mirror modeling.
2nd ss is when two trig are created, 3rd ss shows the mirrored side of the triangle remain unchange when (the white dot) one vertex of the triangle is dragged

[strange cobalt]

day 2 of using lowpoly mode, left is mesh made in mirror modeling and display in view mode. right is what happened after created texture, sad and full of frustration rn...

[strange cobalt]

I should close this and see if they still happen in beta