Thanks Hans,

I tried to modify your example for preventing the capital-Th ligature but this doesn't seem to work. The 'fi' ligature is prevented, but 'Th' still appears as a ligature. This occurs with the original lowercase version too. Have I missed something?

```
\startluacode
     local demo = {
         name    = "demo",
         options = {
             {
                 patterns = {
                     fio  = "f|io",
                 },
                 words = [[ fioot fiots ]],
             },
             {
                 patterns = {
                     fio  = "T|h",
                 },
                 words = [[ This That ]],
             },
         },
     }
     table.save("oeps-fixes.llg",demo)
\stopluacode

\setuplanguage[en][goodies={oeps-fixes.llg}]

\setupbodyfont[ebgaramond]

\starttext
     fiets fiots fiats fioot This That
\stoptext
```
Ben

On Mon, 9 May 2022, at 14:03, Hans Hagen via ntg-context wrote:
On 5/9/2022 9:56 AM, Denis Maier via ntg-context wrote:
> Happens here as well, already on  ConTeXt  ver: 2022.03.12 17:56 LMTX.

> By the way, this even happens without special fonts:

> \blockligatures[Th]

> \definefontfeature[default:blocklig][default][liga=yes,blockligatures=yes]

> \setupbodyfont[myfont]

> \starttext

> \definedfont[Serif*default:blocklig]

>      The This These are missing the `h'

> \stoptext
I'll fix it but it's not the way to do it in lmtx where we have

\startluacode
     local demo = {
         name    = "demo",
         options = {
             {
                 patterns = {
                     fio  = "f|io",
                 },
                 words = [[ fioot fiots ]],
             },
             {
                 patterns = {
                     fio  = "t|h",
                 },
                 words = [[ this that ]],
             },
         },
     }
     table.save("oeps-fixes.llg",demo)
\stopluacode

\setuplanguage[en][goodies={oeps-fixes.llg}]

\setupbodyfont[ebgaramond]

\starttext
     fiets fiots fiats fioot this that
\stoptext

I just added (no upload) this

\startluacode
     local demo = {
         name    = "demo",
         options = {
             {
                 substitutions = {
                     th = "t|h",
                     Th = "T|h",
                     st = "s|t",
                     St = "S|t",
                     fi = "f|i",
                 },
             },
         },
     }
     table.save("oeps-fixes.llg",demo)
\stopluacode

\setuplanguage[en][goodies={oeps-fixes.llg}]

\setupbodyfont[ebgaramond]

\starttext
     The This These fiets and thisthis thisfiets
\stoptext



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                                           Hans Hagen | PRAGMA ADE
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