Below we present the result of the analysis conducted for the issue:
Within "crm:views/mass-email/fields/smtp-account", which is an extension of "views/lead-capture/fields/smtp-account", there is a configuration where the list of available options for the "smtp-account" field is built.

In the configuration, the value for the field is missing. For example, in the "from-address" field, the configuration is as follows:

where "fromAddress" and "fromName" have assigned values.
Adding the "smtpAccount" value to the data model causes the value to be displayed in the mass email details.
In our opinion, this is an issue on the core side of EspoCRM.
The issue is the lack of setting the "smtpAccount" field value based on the data model, which comes from the mass email details.
Within "crm:views/mass-email/fields/smtp-account", which is an extension of "views/lead-capture/fields/smtp-account", there is a configuration where the list of available options for the "smtp-account" field is built.
In the configuration, the value for the field is missing. For example, in the "from-address" field, the configuration is as follows:
where "fromAddress" and "fromName" have assigned values.
Adding the "smtpAccount" value to the data model causes the value to be displayed in the mass email details.
In our opinion, this is an issue on the core side of EspoCRM.
The issue is the lack of setting the "smtpAccount" field value based on the data model, which comes from the mass email details.
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