'url' field exports only if present in 'custom' field

edited July 25, 2021
When I quick copy an entry of type 'journal article', the field 'url' fails to export unless I include it as a custom field under 'extra'. As an example, quick copying the entry whose biblatex export is appended at the end of this message, using the citation style Glossa (https://raw.githubusercontent.com/citation-style-language/styles/master/glossa.csl), will result in the following two exports, depending on whether "url: http://link.springer.com/10.1007/BF00133637" is either omitted from, or included in, 'extra', respectively:

Ayres, Robert U. & Manalur S. Sandilya. 1986. Catastrophe avoidance and risk aversion: Implications of formal utility maximization. Theory and Decision 20. 63–78.

Ayres, Robert U. & Manalur S. Sandilya. 1986. Catastrophe avoidance and risk aversion: Implications of formal utility maximization. Theory and Decision 20. 63–78. Retrieved from http://link.springer.com/10.1007/BF00133637

Can someone help me understand what is producing this difference, or indicate if there is a way to make Zotero include the 'url' field in the export without having to manually copy it to 'extra' for all the entries of this type? Thank you.

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@article{Ayres1986CatastropheAvoidanceRisk,
title = {Catastrophe avoidance and risk aversion: Implications of formal utility maximization},
volume = {20},
url = {http://link.springer.com/10.1007/BF00133637},
abstract = {It is shown that von Neumann-Morgernstern ({NM}) expected utility maximization, as is currently practised, implies an upper bound on the percentage utility that can be sacrificed to reduce the probability or severity of a catastrophe. The major quantitative result of this paper is a simple tabular (and graphic) presentation of the maximum allowed "budget" for catastrophe prevention/abatement within the {NM} framework. The upper limit, which declines in proportion to catastrophe probability, effectively reduces the benefit-cost ratio for catastrophe protection. Use of formal utility maximization methods can thus result in the choice of policies that fail to avoid catastrophes that could be avoided at relatively low cost. Thus the decisions of risk-averse, risk-neutral, and risk-seeing utility maximizers tend to converge in catastrophe prone situations. The prospect theory of Kahneman and Tversky or the elasticity principle of Bernard offer more flexible options of risk aversion under these circumstances. © 1986 D. Reidel Publishing Company.},
pages = {63--78},
journaltitle = {Theory and Decision},
author = {Ayres, Robert U. and Sandilya, Manalur S.},
date = {1986-01},
keywords = {verdaderos},
file = {Ayres1986CatastropheAvoidanceRisk.pdf:/Users/pablostafforini/Zotero/storage/EABVEYUN/Ayres1986CatastropheAvoidanceRisk.pdf:application/pdf},
}
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