I maintain project dropdown_language. An issue has been brought to me #2886977: Wrong links (preprocessed by theme) regarding the alteration of dropbutton.

As i can best trace (comment 15) it seems links which are passes as the URL class object not being processing route_name to render href's but using URI which (i think) is producting the same path for each link once reprocessed.

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SKAUGHT created an issue.