Augmented matrix is not produced correctly

[Paul Smith]

Dear All,

I suspect that I have found a bug: When I do what I do at the attached
screenshot, I do not get what one would have expected (the vertical
line drawn between the first and the second column).

This discussion may be relevant:

https://tex.stackexchange.com/questions/299221/adding-vertical-line-equal-sign-to-augmented-bmatrix-without-using-array

Thanks in advance,

Paul
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Screenshot_2020-05-06_14-32-06.png
Type: image/png
Size: 16964 bytes
Desc: not available
URL: <http://lists.lyx.org/pipermail/lyx-users/attachments/20200506/f3935c26/attachment.png>