Merging cells with borders

[tg44]

Repro1:
Create a line, and a cell, add a border to the cell, merge the cell with others, the border will be only around the original cell.

Repro2:
Create a line, add multiple cells all with bordered, merge them, still only the first cells original borders are appear, the other cells borders are missing.

I didn't look into the code yet, but this is hurting my sheets :D

[HlibRuk]

I had some issues with styles of merged cells.
A workaround that worked for me: declaring empty cells with desired styles, then declaring merge regions.