I discovered that when putting 8 to prefix, the route is saved.
Previosly I used 0 as prefix.
Consider this to be my stupidity, somehow did not get the idea that
prefix means 149/8 notion.
But there still should be some kind of example on that specific screen
or warning that you have something wrong with your route.
** Changed in: network-manager (Ubuntu)
Status: Incomplete => Invalid
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Network Manager, Add IPv4 routes fails
https://bugs.launchpad.net/bugs/268534
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