Fix previous links in the plain server

[jmb6g]

Provide a fix for cases where the previous links can be incorrect in the plain server. This was reported in #4705.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.18 🎉

Comparison is base (2f5ffe7) 81.32% compared to head (315d7f1) 81.51%.

❗ Current head 315d7f1 differs from pull request most recent head b88d791. Consider uploading reports for the commit b88d791 to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4707      +/-   ##
============================================
+ Coverage     81.32%   81.51%   +0.18%     
- Complexity    23650    24345     +695     
============================================
  Files          1425     1464      +39     
  Lines         86399    89009    +2610     
  Branches      11677    11993     +316     
============================================
+ Hits          70265    72556    +2291     
- Misses        10947    11157     +210     
- Partials       5187     5296     +109     

see 1414 files with indirect coverage changes

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[jamesagnew]

Hi @jmb6g - Thanks for the contribution, are you able to add a test that demonstrates the fix?

[jmb6g]

Hi @jmb6g - Thanks for the contribution, are you able to add a test that demonstrates the fix?

Not yet. I have not set up an environment to build locally. I just spotted the flaw during our use of the library.