Ran into the same problem today 1/18/21. Contacted ETHOS support and was informed that phoenixminer 5.1c had this bug.
Since phoenixminer is not native to ETHOS, the regular miner update command does not work.
Suggested to use...
bash <(curl -s https://raw.githubusercontent.com/cynixx3/third-party-miner-installer-for-ethos/master/miner-manager) phoenixminer update
This updated to phoenixminer 5.4c and the problem was fixed.