When you put "^_^" in the title it won't publish (Transaction broadcast error: Permlink is not a valid size.)

[DoctorLai]

1. Put "^_^" in the title
2. error: Transaction broadcast error: Permlink is not a valid size.

[DoctorLai]

It seems the error is from steemd:

Here: https://github.com/steemit/steem/blob/main/libraries/chain/steem_evaluator.cpp#L852
and Here: https://github.com/steemit/steem/blob/main/libraries/chain/steem_evaluator.cpp#L50

[only-dev-time]

I don't think because you got the error message Permlink is not a valid size.
Your error message should have caused by the first assertion. The definitions are

#define STEEM_MIN_PERMLINK_LENGTH             0
#define STEEM_MAX_PERMLINK_LENGTH             256

But your permlink has the length 3 and would therefore be valid for steemd.

[doctorlai-msrc]

@only-dev-time The title actually contains more characters, if you post-fix it with "^_^" then it will trigger this error.