APM Accept Encoding - f5 clears options

Have a v 13.1 f5 APM - the servers see:

Dont need F5 to do the compression, just pass on the header indicating that encoding is supported.

BUT the Accept-Encoding is blank coming from the F5. I ran a request and pulled the headers for that request from the browser and then checked what was seen coming into the app.

Browser sent:

-          Accept-Encoding: gzip, deflate, br

F5 sent:

-          Accept-Encoding:

Do you need an http compression profile saying disabled.no to the options so that the Encoding option is retained ?

seems to be making the connections slow

thanks