lines in file resource content looking like a checksum throws an error

[tmu-sprd]

Describe the Bug

Using Puppet 8.7.0, issuing this line:
$ puppet apply -e "file { '/tmp/test': ensure => 'file', content => \"# anything\n{abc}$\n# anything\" }"
results in a deprecation warning and error:

$ puppet apply -e "file { '/tmp/test': ensure => 'file', content => \"# anything\n{abc}$\n# anything\" }"
Notice: Compiled catalog for my_machine in environment production in 0.01 seconds
Warning: Using a checksum in a file's "content" property is deprecated. The ability to use a checksum to retrieve content from the filebucket using the "content" property will be removed in a future release. The literal value of the "content" property will be written to the file. The checksum retrieval functionality is being replaced by the use of static catalogs. See https://puppet.com/docs/puppet/latest/static_catalogs.html for more information.
   (file: unknown, line: 1)
Error: Could not retrieve content for # anything
{abc}$
# anything from filebucket: Could not get filebucket from file
Error: /Stage[main]/Main/File[/tmp/test]/ensure: change from 'absent' to 'file' failed: Could not retrieve content for # anything
{abc}$
# anything from filebucket: Could not get filebucket from file
Notice: Applied catalog in 0.01 seconds

Expected Behavior

File /tmp/test is created without error with content:

# anything
{abc}$
# anything

Steps to Reproduce

Steps to reproduce the behavior:

1. Run puppet apply -e "file { '/tmp/test': ensure => 'file', content => \"# anything\n{abc}$\n# anything\" }"

Environment

• Version 8.7.0
• Platform Linux

Additional Context

• This block triggers the deprecation warning and maybe the error too:

elsif value.is_a?(String) && checksum?(value)
  # XXX This is potentially dangerous because it means users can't write a file whose
  # entire contents are a plain checksum unless it is a Binary content.
  Puppet.puppet_deprecation_warning([
...

https://github.com/puppetlabs/puppet/blob/main/lib/puppet/type/file/content.rb#L50

• The checksum() function is this:

# Is the provided string a checksum?
def checksum?(string)
  # 'sha256lite'.length == 10
  string =~ /^\{(\w{3,10})\}\S+/
end

https://github.com/puppetlabs/puppet/blob/main/lib/puppet/util/checksums.rb#L41

• Any line that matches the RegEx in the checksum() function seems to trigger the error.
• The whole functionality was scheduled to be removed in Puppet 7, but is still there. Ticket: https://puppet.atlassian.net/browse/PUP-1043