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What
Error during image build if the
PROTOCOL_VERSION_DEFAULT
variable is not set.Why
Images won't reliably work unless the arg is set. The image does fall back to whatever core's max supported protocol version, but we moved away from that a while ago and missed removing that check. The reason we don't rely on that anymore is that core's max supported version is not representative of the entire images max supported version because the image runs multiple software and it's common for core to release a new version before other software.