Remove headers behaves differently and not as expected

Hi guys,
I tried to work with the camel's remove header which works for
some and does not work for other patterns

It works for the below patterns

<removeHeaders pattern="*" />
<removeHeaders pattern="CamelFile*" />

It does not work for
<removeHeaders pattern="*File*" />

Is the above expected?

Also in the exclude pattern I observe that the wildcard patterns * is not
recognised at all.

eg.<setHeader headerName="firstCustomHeader">
<constant>firstCustomHeader</constant>
</setHeader>
<setHeader headerName="secondCustomHeader">
<constant>secondCustomHeader</constant>
</setHeader>
<setHeader headerName="thirdCustomHeader">
<constant>thirdCustomHeader</constant>
</setHeader>
<setHeader headerName="fourthCustomHeader">
<constant>fourthCustomHeader</constant>
</setHeader>

<removeHeaders pattern="*"
excludePattern="fourth*|third*" />
the above removes all the header but does excludes the excludePattern value

<version>2.13.1</version>

Thanks,
Naveen Raj