Version 0.3t seems to have the following bug.
Insert row 1 at row 0 in frontview.
Block texture remains in place before insert.
Probably No texture block is not copy texture.
example
N is No texture block
Non-N alphabets are texture-set blocks
A B C D
E N N F
G N N H
I J K L
When inserting into the row 0 in the block arranged as described above, it becomes as follows
A B C D
E B C F
G N N H
I J K L
I J K L
The expected correct behavior is as follows
A B C D
E N N F
G N N H
I J K L
N N N N