obsidian-ics: recurrent events now break plugin completely. What has changed?

For the last five days, the plugin has been horrible broken: it finds huge numbers of recurrent events from past years ands spews them into my daily note, complaining about “Invalid date” — this with a template that was working perfectly well before Christmas.

Using this template fragment (adjusted to fit the way I name my diaries):

<%*  
var events = await app.plugins.getPlugin('ics').getEvents(moment(tp.file.title,'DD MMMM YYYY - dddd'));  
if (events.length) {  
    tR+= `>[!Danger]- Today's Schedule\n`  
    events.sort((a,b) => a.utime - b.utime).forEach((e) => {  
        const calendar = e.icsName.replace(" ","-");  
        const callUrl = e.callUrl? ` [${e.callType}](${e.callUrl})` : '';  
        const location = e.location? ` 📍 *(${e.location})*` : '';  
        tR+=`- [ ] ${e.time}-${e.endTime} **${e.summary}**${location}${callUrl} #${calendar}\n`  
        if (e.description) {  
            const inlineDescription = e.description.replace(/(?:\r\n|\r|\n)/g," ").replace(/\s{2,}/g," ");  
            tR+=`    - ${inlineDescription}\n`  
        }  
    })  
}  
%>  

I get hundreds of lines complaining of “Invalid date” in recurring events that have long since passed, and don’t in any case affect today:

like this:

# testing ICS
- [ ] Invalid date-Invalid date **Mary Heley** 📍 *(XXXXXX)* #seatrout
  {Repeat 17 times}

- [ ] Invalid date-Invalid date **Renew prescription** #seatrout
- [ ] {repeat 164 times}

- [ ] Invalid date-Invalid date **RMC editorial meeting** 📍 *(zoom see below)* #seatrout
 { repeat 12 times} 
 
 ... and so on, some of these errors going back *20 years*

I have tried this with a conventionally named date template too: it is clearly something in the handling of recurrent events in the plugin.