How long the "long text" data element can be post?

Hi,all,
In my DHIS2 Instance–dhis2 2.40.3, tomcat-9
about the text value type : from the doc , I got this:

but when I post the data with more than about 1150 chinese words, got this :

update error

server failed to update tracker entity instance 服务器更新跟踪实体实例失败
An error occurred, please check import summary.

Even if I change the data type to long text, the same error still occurs.
but I tested in the dhis2 demo server, there canbe post more text words.

why,how ?

thanks

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