After log rotation, UF does not forward logs.

My environment: Splunk Ver 7.2.3 UF Ver 7.2.3 UF monitors `var/log/messages`, and forward it to Splunk. But after log rotation at `02-05-2019 00:05:00`, UF no longer forward it. In internal log, there is message like below. 02-01-2019 00:05:07.503 +0900 ERROR TailReader - File will not be read, is too small to match seekptr checksum (file=/var/log/messages). Last time we saw this initcrc, filename was different. You may wish to use larger initCrcLen for this sourcetype, or a CRC salt on this source. Consult the documentation or file a support case online at http://www.splunk.com/page/submit_issue for more info. But I wonder whether there is a possibility that the rotated file will be the same as the first 256 bytes of the already loaded file (the file one generation ago). Also another weird thing is that **there is a message that begins reading the file as follows just before crc error**, and the **only first 20 lines** from the beginning of the rotated file have been **indexed in Splunk**. 02-01-2019 00:05:04.500 +0900 INFO WatchedFile - Logfile truncated while open, original pathname file='/var/log/messages', will begin reading from start. I can't solve it by myself... **If somebody knows about it, tell me...**