Lane connector cannot be used to make U-turns on medium and large roads with monorail. This applies to stock and workshop assets. The outgoing connector does not appear on the opposite side of the road. I'm not sure whether it is not rendered or just simply does not allow to enable U-turns
edit: details
Can you please go into a little more detail?
What happens? Does the outgoing connector dissapear? Is there no rendered outgoing connector? Does it just not let you select it?
If possible, please upload a video or some images of the issue happening.
My apologies. I edited the description. I'm attaching some screenshots


Here I used this asset: https://steamcommunity.com/sharedfiles/filedetails/?id=1274216127 , but with the stock 4-lane road w/monorail, the result is the same
@aditya-murda Thanks for your report! I've confirmed this is an issue and it will be fixed.
We can probably get this fixed as part of #282 in time for v10.20 release.

Looks like lane connector treats the monorail track as the innermost lane, in which case the 'innermost _road_ lane' would not be considered a candidate for u-turn. So monorail lanes need ignoring when determining innermost road lane.
This will be fixed in v11.1.1 :)
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We can probably get this fixed as part of #282 in time for v10.20 release.