CC1312R: In 2.5kbps long range mode, is it possible to use sync word?

Tool/software:

Hi TI.

When we are at 2.5kbps, we have set the sync word, but we found that even though the sync word is different, we can still receive data.
I would like to ask whether the sync word will be judged at 2.5kbps?

RF_cmdPropTx.syncWord = gFlash_data.SyncWord;
RF_cmdPropRx.syncWord = gFlash_data.SyncWord;

At other data rates, the sync word behavior is normal.