Import word document fails with DuplicateDataRuntimeException when two or more titles with the same heading level contains special characters

How to replicate

• Have a word document with the following hierarchy:

  h1. Heading 1
  h2.   Heading 2:
  h2.   Heading 2:
  

  (note: h1. & h2. indicates the Heading level set in MS. Word)

What is expected

With the Title conflicts set to Rename imported pages if page name already exists, the outcome would be:

h1. Heading 1
h2.   Heading 2:
h2.   Heading 2:0

What actually happens:

• Related to CONF-34864, Confluence renames ":" as "_"
• A system error thrown:

  Cause
  com.atlassian.confluence.pages.DuplicateDataRuntimeException: A page already exists with the title Heading 2_ in the space with key TESC
      at com.atlassian.confluence.pages.DefaultPageManager.throwIfDuplicateAbstractPageTitle(DefaultPageManager.java:1132)
  

• Nothing is imported to Confluence