parLapply is unable to call a function in a custom package using clusterExport(cl, "func").

func <- function(x) {
  output <- myPkg::myFunc(
    file = x,
    path = "/local/path"
  )
  output
}
vector = c("file1", "file2")

cluster <- makeCluster(10)
clusterEvalQ(cluster, library(myPkg))
clusterExport(cluster,  "func")

parLapply(cluster, vector, func)

parLapply reports
Error in checkForRemoteErrors(val) :
2 nodes produced errors; first error: argument “func” is missing, with no default

Note that “myFunc” replies on many other functions in the custom package, although I would think clusterEvalQ would pick them up without exporting to the cluster.