%<>% isn’t exported by dplyr (only %>% is). You need to load magrittr instead.
Your reproducible example is running into a subtle magrittr bug, which causes the evaluation of pipeline expressions to search for some operators in magrittr’s scope, rather than in the calling scope. That way, x %<>% y %>% z, which evaluates as `%>%`(x %<>% y, z), finds and evaluates magrittr’s `%<>%` operator.
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