Error while opening a document in R 6.x --"Document has too many paragraphs - it must be split into several documents"

I have a document with huge data in its richtext field.

When i try to open the document in R6.x, i get the error message “Document has too many paragraphs - it must be split into several documents”.

But when i try to open the same document in R5.x, i do not face any problem.

Does anyone know how to fix this issue in R6.x or a workaround in R6.x ?