Content Translation tries to transfer templates from the original article into the translation by (a) looking for the equivalent template using Wikidata, (b) mapping the parameters between the templates, and (c) communicating any issues that prevent to complete the process (T192271).
For the case of inline templates with unnamed parameters, it is possible that the corresponding templates have the same number of parameters but in a different order. This results in the adaptation process to complete apparently successfully, but the template not rendering the expected result.
In the example below, the Age template was adapted from English ({{age|year|month|day}}) into the corresponding Spanish template Edad, where a different order was expected in the parameters ({{edad|day|month|year}}). As a result, the template in the translation displays an error message, but since the error message is displayed as content it cannot be detected by Content Translation as an error.
Users are able to edit the problematic template and change the values for the different parameters:
Apart from improving the way templates can communicate their rendering errors (something that may be of interest for the Parsing-Team--ARCHIVED), we can consider providing additional information/options for inline templates with unnamed parameters considering these have a higher risk of being wrongly adapted.
Possible solutions to be explored.

