Alonso Santamaria 

I cannot reproduce this at all.  Can you share a video of what you are doing perhaps? Can you also confirm where you are storing your TMs?

For example:

Thanks! 

Here is the video. I open the Settings of the TM, add the (tested) segmentation rule, accept. Re-check, there it is. Close Studio. Open Studio. Segmentation rulo no longer there.

www.loom.com/.../4dc8bf70431845c1995c630ae2d8d6fe

Alonso Santamaria 

Thank you, that was helpful.  I noticed two things that may be worth exploring:

1. you already had a custom rule there, I didn't.  So you added another one.
2. you opened the settings from a TM that was open in the maintenance view, I didn't.  Try closing it  and don't open to add the rule or test if it's still there.

I was able to reproduce your problem once just now after adding to an existing rule.  But I couldn't do it again.  Perhaps you can play around with these thoughts and see if it sticks.  It could be related to having the TM open... I'm not sure why... but worth trying these things.

Alonso Santamaria 

Thank you, that was helpful.  I noticed two things that may be worth exploring:

1. you already had a custom rule there, I didn't.  So you added another one.
2. you opened the settings from a TM that was open in the maintenance view, I didn't.  Try closing it  and don't open to add the rule or test if it's still there.

I was able to reproduce your problem once just now after adding to an existing rule.  But I couldn't do it again.  Perhaps you can play around with these thoughts and see if it sticks.  It could be related to having the TM open... I'm not sure why... but worth trying these things.

Thanks! I will try those different options. Have a great day!