Hi all.
I'm not sure what the ideal outcome is. It depends on each user's case. In principle, indirect buffers have identical text content as their base buffer, but different view properties, so the previews not showing in the indirect buffer agrees with this principle. I therefore, agree with Paul's comment.
On your comment:
In theory, base buffer and cloned buffer
can have different master file as you say and the user can make use of
that duality. However, the user must remember which buffer has which
master file in that case, between buffers with identical contents. That
doesn't seem a useful feature to me.
This can be achieved by renaming the buffer accordingly, for example file.tex<foo> has master foo.tex and file.tex<bar> has master bar.
Best,
Vangelis