## Motivation / Problem

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    * What problem does this solve?
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* For features or gameplay changes:
    * What was the motivation to develop this feature?
    * Does this address any problem with the gameplay or interface?
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## Description

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* For bug fixes:
    * How is the problem solved?
* For features or gameplay changes:
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    * How does it improve/solve the situation described under 'motivation'.
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## Limitations

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## Checklist for review

Some things are not automated, and forgotten often. This list is a reminder for the reviewers.
* The bug fix is important enough to be backported? (label: 'backport requested')
* This PR affects the save game format? (label 'savegame upgrade')
* This PR affects the GS/AI API? (label 'needs review: Script API')
    * ai_changelog.hpp, gs_changelog.hpp need updating.
    * The compatibility wrappers (compat_*.nut) need updating.
* This PR affects the NewGRF API? (label 'needs review: NewGRF')
    * newgrf_debug_data.h may need updating.
    * [PR must be added to API tracker](https://wiki.openttd.org/en/Development/NewGRF/Specification%20Status)