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Can't see anything special about this table (I've created a minimal copy which still has error, see below) but it does not display in v3.4 but does in v3.2.
Tried Exporting Features to a GeoPackage ( to troubleshoot the error) which shows that it adds another field called GEOM, seeing the actual geometry one as TEXT

Export to vector file failed.
Error: Feature write errors:
Feature creation error (OGR error: sqlite3_exec(CREATE TABLE "Temp" ( "fid" INTEGER PRIMARY KEY AUTOINCREMENT NOT NULL, "geom" POLYGON, "ID" MEDIUMINT, "Postcode" TEXT, "Date Introduced" DATE, "Date Withdrawn" DATE, "CodePoint UPP" TEXT, "geom" TEXT)) failed: duplicate column name: geom)

In MSSQL, this is the temp file I created which has Ordnance Survey Polygon data in, all validated.

USE [BDUK 3.0]
GO

SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE TABLE [dbo].[Temp](
[ID] [int] IDENTITY NOT NULL,
[Postcode] [nvarchar](10) NOT NULL,
[Date Introduced] [date] NULL,
[Date Withdrawn] [date] NULL,
[CodePoint UPP] [nvarchar](255) NULL,
[geom] [geometry] NULL,
PRIMARY KEY CLUSTERED
(
[Postcode] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
GO

Insert INTO [dbo].[Temp]
( Postcode,[Date Introduced],[Date Withdrawn],[CodePoint UPP],[geom])
(SELECT Postcode,[Date Introduced],[Date Withdrawn],[CodePoint UPP],[geom]
FROM [CSW3 Postcode Mapping IA]
)
--(25651 rows affected)