F5 BIG-IP show filtering with grep problem

Default shell we are using is tmsh / tmos, so the commands I put here are placed to that shell. I mentioned that grep is working properly in bash, but, not by using tmsh as first work in command line, as the same issue appears as if the same command is being placed into the tmsh / tmos shell itself.

Running command "more", for example, to see log file, for example "/var/ltm/log" from bash is working properly, that is workaround.

Question is related to the same command in:

 Product    BIG-IP

 Version    14.1.0.6 (Here it is working properly in tmsh / tmos)

 Build      0.0.9

 Edition    Point Release 6

and:

Product    BIG-IP

Version    14.1.2.1 (Here it is not working properly in tmsh / tmos)

Build      0.0.4

Edition    Point Release 1

Again, in bash grep works in any version. I am mentioning the issue only for the F5 tmsh / tmos.