Replace NA by other value in column_not working_is it because I have a tibble instead of df?

tidyverse
2

It looks like I found a solution from another source (R - Replace Column Value with Another Column - Spark By {Examples}):
mutate(depth2_cm = ifelse(depth2_cm == 'NA', depth1_cm, depth2_cm))
It works! Posting in case it is useful to someone.